When speaking with family or friends, we often feel most comfortable using informal, familiar language. For instance, if a friend were to ask you, "Where are you going?", you probably would not answer, "I am going to the beach." In casual conversation, we often use sentence fragments and contractions to save time. During a conversation, we are also unable to stop what we are doing to look up facts and statistics, so we might use imprecise words such as "a lot," "okay," and "et cetera." We may find ourselves using slang, colloquialisms, and vague or unclear words when talking with our friends and family, but formal writing requires precise, unambiguous language.
I suppose that a lot of us who have been very young in New York have the same scenes in our home screens. I remember sitting in a lot of apartments with a slight headache about five o’clock in the morning. I had a friend who could not sleep, and he knew a few other people who had the same trouble, and we would watch the sky lighten and have a last drink with no ice and then go home in the early morning, when the streets were clean and wet (had it rained in the night? we never knew) and the few cruising taxis still had their headlights on and the only color was the red and green of traffic signals. The White Rose bars opened very early in the morning; I recall waiting in one of them to watch an astronaut go into space, waiting so long that at the moment it actually happened I had my eyes not on the television screen but on a cockroach on the tile floor. I liked the bleak branches above Washington Square at dawn, and the monochromatic flatness of Second Avenue, the fire escapes and the grilled storefronts peculiar and empty in their perspective.
Here is another example of a simple error of omission that could have been caught if the student had read the essay aloud or given it to a friend to read. The word "of" should be between "calculation" and "the." That one small error makes the entire sentence awkward and confusing. If the instructor has to reread the sentence to try to understand its meaning, the flow of the essay is interrupted. If this happens often enough in the essay, it gives an overall bad impression on what otherwise might be a very good paper in terms of research.